Exiv2 library features

Fast read and write access to the Exif, IPTC, and XMP metadata of an image
Easy to use and extensively documented C++ API
Conversions of Exif and IPTC metadata to XMP and vice versa
Smart IPTC implementation that does not affect data that programs like Photoshop store in the same image segment
Exif Makernote support:
- Makernote tags can be read and written just like any other metadata
- Sophisticated write algorithm avoids corrupting the Makernote
Simple interface to extract previews embedded in RAW images and Exif thumbnails
Set and delete methods for Exif thumbnails

Library examples

Exiv2 command line utility features

Print Exif, IPTC and XMP image metadata in different formats: Exif summary info, interpreted values, or the plain data for each tag
Set, add and delete Exif, IPTC and XMP image metadata from command line modify commands or command scripts
Adjust the Exif timestamp (that's how it all started...)
Rename Exif image files according to the Exif timestamp
Extract, insert and delete Exif, IPTC and XMP metadata and JPEG comments
Convert from Exif and IPTC to XMP properties and vice versa
Extract previews from RAW images and thumbnails from the Exif metadata
Insert and delete the thumbnail image embedded in the Exif metadata
Print, set and delete the JPEG comment of JPEG images
Fix the Exif ISO setting of picture taken with Canon and Nikon cameras

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The roadmap has details for the upcoming version.